Sand-blast apparatus.



, PATENTED 0OT.23, 1906. a. IIOUGHMAN & K. HESS.

SAND BLAST APPARATUS. APPLICATION nLnp NOV. 13. 1905.

CHARLES A. LOUGHM'AN'AND,

KARL HES s. or ,BRADDOOK; PE N NsYL-i 1 VANIA.

Y SAND-BLASTIAPPARATLJS).

' Specification of Letters Patent. Applicationfiledllovember'lB,1965.Serial No. 287.141. 1

To 'aZZ whom it may concern! 2 I 1 Be it known that we, CnAnLEs A.LOUGH- iwAiv and KARL HEss, residents of Braddock; 1n the county ofAllegheny and State 'of .this finish applied thereto.

Pennsylvania, have invented a new and use-. ful Improvement inSand-Blast Apparatus; and we do,-hereby, declare the following to'be afull, clear, and exact description thereof. f- This invention relates tosand-blast appa ratus, and especially to apparatus of this characterforuse by small: manufacturing jewelers and in other small shops where itis impractical or impossible to have the usual power apparatus of, thiskind.

' In the finishing of many ,pieces of jewelry and other ornamentalobjects it is necessary to subject the surface to the action of asandblast in orderto give a dull or satin finish theretofi Many smallmanufacturing jewelers have occasion to give this finish to manyarticles made by them. Heretofore they have been compelled to send thearticle to some larger establishment in order to have The cost ofmaintaining an ordinary sand-blast apparatus, as well as the space andpower necessary therefor, is prohibitive in small shops.

Our invention is intended to supply a sandblast apparatus which willmeet the conditions above named. All jewelers are supplied with a smallfoot-bellows or hand-blower for operating the blowpipe used in meltingprecious metals. In our device this same bellows or blower can be usedin conjunction with a special casing which we provide for doing thesand-blasting.

The invention consists in the particular arrangement of partshereinafter described and claimed.

In the accompanying drawings, Figure 1 is a perspective v1ew of oursand-blast device. Fig. 2 1s a vertical section therethrough. Fig. 3 isa horizontal section thereof on the line 3 3 Fig. l; and Fig. 4 is averticalsection of a portion of the device, taken on a plane at rightangles to the sectionshown in Fig. 2.

Our device comprises a suitable box or casing 1, which at its upperportion is provided with a rece tacle or hopper 2 for the sand, thisbeing c osed by a suitable cover 3. The sand receptacle or hopper isprovided with a nozzle 4, which is controlled by a suitable damper orvalve 5. Projecting into the sand-nozzle 4 is an air-nozzle 6, forming aportion apipe 7, leadir'1 g to the -Q -f thecasi'ngand adapted-toreceive the air; blast from'any suitable source, such, as the footbellows 8, whichis connected, by means of ,a tube ,.9, to the pipe 7 Thecompressed air comingthrough t e'nozzle 6 acts on the principle of aninjector to blow the sand out through the nozzle .4 in a small but.suffi-' ciently powerful blast. f 1: I. I The chamber underneath thenozzle dis provided onfone side with a suitable opening 10, throughwhichthe work can be presented tothe sand-blast andwithdrawn there from.In order to kee the dust from fly: ing out, this opening wi 1 beprovided with a suitable automatically-closing shutter, such as a sheetof rubber or other elastic fabric 11, rovided with a slit 12, throughwhich the and of the operator can be inserted to hold the workunderneath the sand-blast. The fabric being elastic will close aroundthe Patented 0617.23, 190 6.

wrist of the operator and prevent the dust pan 16 for receiving the sandthat is blown down, which pan can be withdrawn through. one side of thecasing, as shown, in order that the sand may be again transferred to thehopper or receptacle 2.

The operation of the apparatus will be readily understood from theforegoing descriptlon and illustration.

The device is exceedingly simple, occupies a very small. space, and isportable. The ordinary foot-bellows or blower used by jewelers willprovide sufiicient air-pressure to operate the same.

The apparatus is cheap of manufacture and is therefore available foreven small jeweler-shops. As a consequence all work requiring a satinfinish can be finished right in the shop and Without incurring theexpense and delay of sending it to a larger establishment for suchfinish.

What we claim is 1 A sand-blast apparatus for small-shop use, comprisinga sand holder or receptacle, an imperforate cover closing the same, anozzle extending from the bottom of said sandholder, a valve controllingthe passage to said nozzle, an air-nozzle associated with saidsand-nozzle and acting as an injector to roduce the blast, a closedchamber into W ich said nozzles project, said chamber being providedwith an opening for the admission and withdrawal of the work, anautomatically closing shutter for said opening and a removablesand-receiving receptacle in the bottom of said chamber.

2. A sand-blast apparatus for small-shop use, comprising a sand holderor receptacle provided with a nozzle, an air-nozzle associated with saidsand-nozzle and acting as an injector to produce the blast, a closedchamber into which said nozzles project, said chamber being providedwith an opening for the ad mission and withdrawal of the work, and anelastic fabric closing said opening and provided with a single narrowslit through which the work is entered and withdrawn.

3. A sand-blast apparatus for small-shop use, comprising a sand holderor receptacle provided with a nozzle, an air-nozzle associated with saidsand-nozzle and acting as an injector to produce the blast, a closedchamber into which said nozzles project, said chamber being providedwith a window through which the progress of the work can be viewed, andwith an opening for the admission and withdrawal of the work, and anelastic fabric closing said opening and )I'O- vided with a single narrowsht through which the work is entered. and withdrawn.

4. Sand-blast apparatus for small-shop use, comprising a sand holder orreceptacle provided with a nozzle, an air-nozzle associated with saidsand-nozzle and acting as an injector, a closed chamber into which saidnozzles project, said chamber being provided with an opening for theadmission and withdrawal of the work, and a fabric closing said openingand provided with a narrow elongated opening having an elastic edge.

In testimony whereof we, the said CHARLES A. LOUGHMAN and KARL Hnss,have hereunto set our hands.

CHARLES A. LOUGHMAN. KARL HESS.

Witnesses:

JOHN F. MoCUNE, IDA L. LEECH.

